Namespace
Varianti

std::getline

Da cppreference.com.
< cpp‎ | string‎ | basic string

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C++
 
Stringhe libreria
Null-stringhe terminate
Original:
Null-terminated strings
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Byte stringhe
Multibyte stringhe
Stringhe larghe
Classi
Original:
Classes
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basic_string
char_traits
 
std::basic_string
Membri funzioni
Original:
Member functions
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basic_string::basic_string
basic_string::operator=
basic_string::assign
basic_string::get_allocator
Elemento accesso
Original:
Element access
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basic_string::at
basic_string::operator[]
basic_string::front(C++11)
basic_string::back(C++11)
basic_string::data
basic_string::c_str
Iteratori
Original:
Iterators
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basic_string::begin
basic_string::cbegin
(C++11)
basic_string::end
basic_string::cend
(C++11)
basic_string::rbegin
basic_string::crbegin
(C++11)
basic_string::rend
basic_string::crend
(C++11)
Capacità
Original:
Capacity
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basic_string::empty
basic_string::size
basic_string::length
basic_string::max_size
basic_string::reserve
basic_string::capacity
basic_string::shrink_to_fit(C++11)
Operazioni
Original:
Operations
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basic_string::clear
basic_string::insert
basic_string::erase
basic_string::push_back
basic_string::pop_back(C++11)
basic_string::append
basic_string::operator+=
basic_string::compare
basic_string::replace
basic_string::substr
basic_string::copy
basic_string::resize
basic_string::swap
Cerca
Original:
Search
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basic_string::find
basic_string::rfind
basic_string::find_first_of
basic_string::find_first_not_of
basic_string::find_last_of
basic_string::find_last_not_of
Costanti
Original:
Constants
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basic_string::npos
Non membri funzioni
Original:
Non-member functions
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operator+
operator==
operator!=
operator<
operator>
operator<=
operator>=
swap(std::basic_string)
operator<<
operator>>
getline
stoi
stol
stoll		(C++11)
(C++11)
(C++11)
stoul
stoull		(C++11)
(C++11)
stof
stod
stold		(C++11)
(C++11)
(C++11)
to_string(C++11)
to_wstring(C++11)
Helper classi
Original:
Helper classes
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hash<std::string>
hash<std::wstring>
hash<std::u32string>
hash<std::u16string>		(C++11)
 
Elemento definito nell'header <string>
template< class CharT, class Traits, class Allocator >

std::basic_istream<CharT,Traits>& getline( std::basic_istream<CharT,Traits>& input,
                                           std::basic_string<CharT,Traits,Allocator>& str,

                                           CharT delim );
 (1)
template< class CharT, class Traits, class Allocator >

std::basic_istream<CharT,Traits>& getline( std::basic_istream<CharT,Traits>&& input,
                                           std::basic_string<CharT,Traits,Allocator>& str,

                                           CharT delim );
 (1) (dal C++11)
template< class CharT, class Traits, class Allocator >

std::basic_istream<CharT,Traits>& getline( std::basic_istream<CharT,Traits>& input,

                                           std::basic_string<CharT,Traits,Allocator>& str );
 (2)
template< class CharT, class Traits, class Allocator >

std::basic_istream<CharT,Traits>& getline( std::basic_istream<CharT,Traits>&& input,

                                           std::basic_string<CharT,Traits,Allocator>& str );
 (2) (dal C++11)
getline legge i caratteri da un flusso di input e li colloca in una stringa:
Original:
getline reads characters from an input stream and places them into a string:
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1)
Si comporta come UnformattedInputFunction, salvo che input.gcount() non è interessato. Dopo la costruzione e la verifica dell'oggetto sentinella, esegue le seguenti operazioni:
Original:
Behaves as UnformattedInputFunction, except that input.gcount() is not affected. After constructing and checking the sentry object, performs the following:
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1)
Chiamate str.erase()
Original:
Calls str.erase()
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2)
Estrae personaggi input e li aggiunge al str fino a quando uno dei seguenti casi (controllate nell'ordine elencato)
Original:
Extracts characters from input and appends them to str until one of the following occurs (checked in the order listed)
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a)
end-of-file sul input condizione, in questo caso, getline set eofbit e ritorna.
Original:
end-of-file condition on input, in which case, getline sets eofbit and returns.
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b)
il carattere successivo ingresso disponibile è delim, come testato da Traits::eq(c, delim), nel qual caso viene estratto il carattere delimitatore da input, ma non è aggiunto al str.
Original:
the next available input character is delim, as tested by Traits::eq(c, delim), in which case the delimiter character is extracted from input, but is not appended to str.
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c)
Caratteri str.max_size() sono stati memorizzati, in questo caso, getline set failbit e ritorna.
Original:
str.max_size() characters have been stored, in which case getline sets failbit and returns.
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3)
Se nessun carattere sono stati estratti per qualsiasi motivo (nemmeno il delimitatore scartato), getline set failbit e ritorna.
Original:
If no characters were extracted for whatever reason (not even the discarded delimiter), getline sets failbit and returns.
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2)
Stessa getline(input, str, input.widen(’\n’)), cioè, il default è il carattere delimitatore linea di fondo.
Original:
Same as getline(input, str, input.widen(’\n’)), that is, the default delimiter is the endline character.
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[modifica] Parametri

input -
il flusso per ottenere i dati
Original:
the stream to get data from
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str -
la stringa di mettere i dati in
Original:
the string to put the data into
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delim -
il carattere delimitatore
Original:
the delimiter character
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[modifica] Valore di ritorno

input

[modifica] Esempio

Il codice seguente chiede all'utente per il loro nome, poi li saluta con quel nome .
Original:
The following code asks the user for their name, then greets them using that name.
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#include <string>
#include <iostream>
 
int main()
{
    std::string name;
    std::cout << "What is your name? ";
    std::getline(std::cin, name);
    std::cout << "Hello " << name << ", nice to meet you.";
}

Possible output: 

What is your name? John Q. Public
Hello John Q. Public, nice to meet you.
Estratto da "https://it.cppreference.com/mwiki/index.php?title=cpp/string/basic_string/getline&oldid=27307"